Chapter 10 Raceway Systems 159 Copyright Goodheart-Willcox Co., Inc. Apply and Analyze 1. What is shrink? 2. How is a box offset made? 3. Which article of the NEC outlines rules regarding rigid metal conduit? 4. Which article of the NEC outlines rules regarding rigid PVC conduit? Critical Thinking 1. When corrosion is a factor, what type of conduit should be used? What article in the NEC addresses this type of conduit? 2. Explain a situation in which you would use ENT. Know the Code A copy of the NEC 2020 is required to answer these questions. 1. What is the title of Section 250.118? 2. What does the informational note in Section 320.10 state?